Cheap Flights from Denver International to San Juan

Compare Denver International to San Juan flight deals

Find the cheapest month or even day of the year to fly to San Juan

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Flight deals from Denver International to San Juan

Looking for a cheap last-minute deal or the best return flight from Denver International to San Juan? Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from Denver International to San Juan

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Denver International to San Juan flights are currently cheapest in October.

Direct flights from Denver International to San Juan

Alternative Denver International to San Juan routes

Looking for the cheapest, fastest or easiest route from Denver International to San Juan? You could fly into the following airports instead.

Denver to San Juan: Flight information

The things to know before you go.
Cheapest flight foundR 2,082
Cheapest month to flyOctober
Average flight time5 hrs, 41 mins
Most popular airlineUnited
Average flights per week8

Finding cheap flights from Denver International to San Juan: Frequently asked questions

There are 6 airports in San Juan: San Juan Isla Grande, San Juan Luis Munoz Marin, Roosevelt Roads, Ponce, Vieques, and Culebra.
The best price we found for a return flight from Denver International to San Juan is R 4,698. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
5 hours and 41 minutes is the average flight time from Denver International to San Juan.
United flies direct from Denver International to San Juan.
As of September 2025, there are 8 flights per week flying from Denver International to San Juan.
The cheapest month to fly from Denver International to San Juan is usually October.
If you're flying from Denver International Airport, the cheapest airport near San Juan is San Juan Luis Munoz Marin – which is 11.3 km away from the centre of San Juan. We've found flights into this airport from R 4,698.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Denver International Airport to San Juan on Wednesday, 8 October 2025.
Yes – the average flight time is 5 hours and 41 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to San Juan but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to San Juan is around 40 days in advance, so don’t leave your flight to the last minute.
In September, the average temperature is usually around 28°C. August is typically the warmest month in San Juan, when it usually averages around 29°C. You can expect the least rain in February. The coldest month is January, with temperatures averaging 23°C. The rainiest month is September.
Currently, Frontier Airlines and United offer the cheapest flight tickets to San Juan.

Travelling from Denver International Airport (DEN) to San Juan: what you need to know

  • The average length of a direct flight from Denver International Airport to San Juan is 6 hours 35 minutes.

  • San Juan is two hours ahead of Denver, where Denver International Airport is located. San Juan observes the UTC-4 timezone.

  • With six weekly departures between the two airports, Denver International Airport (DEN) to Luis Munoz Marin International Airport (SJU) is the most popular route. Hop on United Airlines's 09:40 flight to get your journey from DEN to SJU underway.

  • To avoid missing your DEN to San Juan flight, allow plenty of time to check in and drop off your luggage. Turning up two hours ahead of international departures and one hour before domestic flights is the standard rule.

  • If you're travelling during a bank holiday or another peak period, give yourself extra time. A good rule is two hours ahead of domestic flights and up to four hours before international departures. Queues at check-in and security will be longer.

  • Start your journey at DEN and fly straight to Luis Munoz Marin International Airport (SJU). That will be your arrival point when searching for Denver International Airport to San Juan tickets.

  • United Airlines is a leading airline that offers direct flights from Denver International Airport to San Juan.

  • Stopovers are the ideal opportunity to break up your trip and possibly even explore a different city. When searching for flight tickets from DEN to San Juan, deselect the 'Direct flights only' box to see where you can visit along the way. Top options include:

    • Hartsfield-Jackson Atlanta International Airport (ATL)

    • Orlando International Airport (MCO)

    • Southwest Florida International Airport (RSW)

  • Travelling from central Denver to DEN takes about 1 hour 30 minutes by public transport. If you ride-share, drive or grab a cab, you'll cover the 31 kilometres in 35 minutes or so, depending on traffic.

  • Booking a hotel room for the night can take the stress out of reaching the airport on time. If you're looking for a place to stay before your flight from Denver International Airport to San Juan, consider The Westin Denver International Airport. It's a quick drive from DEN.

  • Denver International Airport maintains a solid on-time performance, so you're unlikely to face delays. Departures from DEN arrive at their destination as scheduled 80.23% of the time.

  • DEN's address is 8500 Pena Boulevard.

How to find the cheapest flights from Denver International Airport (DEN) to San Juan

  • The best price we've found for a one-way Denver International Airport to San Juan flight is R 2,082. The cheapest price for a return flight is R 4,698. Bear in mind fares can change due to demand at the time of booking.

  • Score cheap flights from DEN to San Juan by booking one month ahead. According to our research, that's the best time for finding the biggest deals.

  • May is the best month for landing an awesome deal on Denver International Airport to San Juan tickets. If you'd like to travel at a different time of year, the 'Whole month' tool will show you the lowest prices across every month.

  • There's no need to keep checking in to find out if fares have dropped when you set up a Price Alert. We'll update you as soon as there's an even bigger deal on cheap flights from DEN to San Juan.

  • Tailor your flights with filters. Select your arrival and departure times, airlines and total journey duration. You can also sort your results by 'Best,' 'Cheapest' or 'Fastest' flights from Denver International Airport to San Juan.

Airports in San Juan

Luis Munoz Marin International Airport (SJU)

  • Luis Munoz Marin International Airport (SJU) is around 8 kilometres from central San Juan. If you're catching a cab or a ride-share, the drive will take roughly 10 minutes.

  • Travelling by public transport typically takes 55 minutes.

  • Consider staying in a hotel near SJU if you're coming in on a late flight from Denver International Airport to San Juan. Check in to one of these accommodation options and make arrival day easier:

  • Go where the road takes you with a Luis Munoz Marin International Airport rental car. Book your wheels from Sixt, Ace Rent a Car or U-Save and chase adventure across San Juan and beyond.

  • To get the best deal, reserve your vehicle from Luis Munoz Marin International Airport about two weeks ahead of your flight from DEN to San Juan.

Fernando Luis Ribas Dominicci Airport (SIG)

  • Fernando Luis Ribas Dominicci Airport (SIG) is roughly 8 kilometres from central San Juan. Once you've disembarked your flight from Denver International Airport to San Juan, it'll take you around 15 minutes to reach the heart of the city in a ride-share or cab.

  • Travelling by public transport will take around 1 hour.

  • Following your DEN to San Juan flight, unwind at a hotel near SIG. These are some comfortable options that'll help you slip into relaxation mode:

Best time to go to San Juan

  • Carefully consider your dates before booking your flight from Denver International Airport to San Juan. The city comes alive in peak season, but hotel prices are often higher and major attractions can get busy. Visit San Juan in low season if you prefer a more relaxed vibe.

  • Lock in a Denver International Airport to San Juan flight ticket with a departure in September if you want to visit the city during its warmest month. You can expect temperatures to range from 23ºC (73ºF) to 33ºC (91ºF).

  • Look for cheap tickets from DEN to San Juan in February if you'd rather travel when it's cooler. Temperatures are at their lowest then, ranging between 20ºC (68ºF) and 28ºC (82ºF) on average.

More about San Juan

  • Start your San Juan trip right by choosing the perfect place to stay. As soon as you've booked your flight from Denver International Airport to San Juan, explore our range of accommodation options including:

  • Every great adventure has to include a little sightseeing. La Garita del morro de san juan bahia, Castillo San Felipe del Morro and Fortaleza Street are must-visits when exploring San Juan.

Explore more of Puerto Rico

  • San Juan has loads to offer, but there are so many other corners of Puerto Rico you should also see. Around 113 kilometres west of San Juan, a visit to Aguadilla will keep your itinerary packed. Start with leading attractions like El Parterre, Aguadilla Ice Skating Arena and Bandera de los Reyes Magos.

  • Around 105 kilometres west of San Juan, Isabela is another favourite stop in Puerto Rico. No visit is complete without checking out Amarillo Mango, Urb. Llanos Piscina Park and Noches de Artesania.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.